Sectional sofa



FIG. 1 is a perspective view of a sectional sofa showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left front view thereof;

FIG. 4 is a right front view thereof;

FIG. 5 is a right rear view thereof; and,

FIG. 6 is a left rear view thereof. 

The ornamental design for a sectional sofa, as shown and described. 